Pump-piston



H G R U B W E N nu. m .m M m PUMP PISTON.

Patented May 22, 1883.

. IN VENTOR.

WITNESSES ATTORNEYS UNITED STATES PATENT OFFICE.

CHARLES NEWBURGH, OF BELOIT, WISCONSIN.

PUMP-PlsToN.,

SPECIFICATION formingvpart of Letters Patent No. 277,919, dated May` 22, 1883.

Application ined september 15,1882. (Nb modem' i a citizen ot' the United States, residing at Beloit, county of Rock, and State ot' Wisconsin, have invented certain new and useful Improvements in Pump-Pistons, of which the t'ollowing is a specication.

My invent-ion relates to improvements in pump-pistons, in which the piston or plunger packin gis formed by aaring or conical-shaped rj ng held between two beveled surfaces on the piston-disk, and acts also as a valve in combinaiion with grooveson the circumference of the piston.

The objects of my invention are, first, to make a self-adjusting piston-packing; second, to Asimplify the construction ot' the piston; third, to lessen the friction and resistance ot' the piston against the cylinder-barrel in the reciprocating movement of the piston. I accomplish these objects by the mechanism illustratedin the accompanying drawings, in whichf Figure l is a vertical central section, and Fig. 2 is a cross-section of the piston.

Similar` letters refer to like parts in the different views. n

The two disks or parts P and P' ot' thepiston in Fig. l are provided with beveled surfaces corresponding to the shape or angle of the packing-ring R, which is an inverted hollow cone, made ot' leather or some other suitable material, and is firmly held in place by a nut on the end ot' piston-rod r. The lower part, P, of the piston has grooves or corrugations G, ruiming lengthwise up and down on its outer circumference, to provide a way for the water to pass up during the4 downward stroke ot' the piston. The material between the grooves forming an angle with the beveled surface heretofore described ends in al row of points for the better support ot' the ringpacking R. P is smaller in diameter than P, so as not to interfere with the grooves G, which are covered bythe packing-ringR. At the upward stroke ofthe piston the packing-ring 1t isheld firmly down againstthe grooves G and against the sides of the cylluder-barrel by thepressure of the water above but during the downward stroke the packingring R is to some extent closed by the pressure of the water in the lower part ofthe cylinder-barrel, and permits the free passage of the water upward above the piston.

Heretot'ore pump-pistons have been usually made hollow, and the piston-valve has been inclosed in a cage, and thc piston-packing has been wound around the surface of the circumference `of the piston. i

My packing permits a perfectly loose lit of the piston to the cylinder-barrel and reduces the friction to a minimum, while it adjusts itself, andA is perfectly water-tight during the upward stroke of the piston.v

Iam aware that it is not new to employ, in con nectionwith a channeled or notched piston, a packing-ring arranged to serve also as a valve; but 1 am not aware that a combined valve and piston has hitherto been formed ot' a` notched or channeled disk having its upper face formed with a Haring seat or recess, a a second disk shaped to conform to said seat or recess, and a leather packing clamped between the periphery of the second disk and the tia-ring walls ot' the rst. This construction permits the use of a narrow strip of packing material, instead of a large circular piece, such as is required where the secondbeveled disk is not employed, and renders the packing tirmer and more etlicient, because itgives a support to thesame near its edge.

I am also aware that a piston-packing has been seated between the inclined wall of a recess in the piston and the beveled face of a thin ringplaced loosely upon it;` butsuch packing was not adapted or arranged to act as a valve.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. The herein-described piston, consisting of grooved or channeled disk P, having beveled tlange, as shown, disk P,having beveled edge, and intermediate packing-ring, R, clamped between the disks P P and extending slightly beyond the circumference ot the latter, as and for the purpose explained. 4

2. The herein-described piston, consisting -ot' disks P P', the former having channels in its periphery, and both beveled as explained, the packing-ring R, clamped between said disksLcentral rod, r, and nuts applied to said rod above and below the disks, as shown.

CHARLES NEWBURGH.

Witnesses A. REITTER, It. E. HEINY.

IOO 

